libcxx/include/__config - llvm-project - Git at Google


            
            // -*- C++ -*-

            
            //===----------------------------------------------------------------------===//

            
            //

            
            // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.

            
            // See https://llvm.org/LICENSE.txt for license information.

            
            // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

            
            //

            
            //===----------------------------------------------------------------------===//


            #ifndef _LIBCPP___CONFIG

            
            #define _LIBCPP___CONFIG


            #include <__config_site>


            #ifndef _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER

            
            #  pragma GCC system_header

            
            #endif


            #ifdef __cplusplus


            #  include <__configuration/abi.h>

            
            #  include <__configuration/attributes.h>

            
            #  include <__configuration/availability.h>

            
            #  include <__configuration/compiler.h>

            
            #  include <__configuration/diagnostic_suppression.h>

            
            #  include <__configuration/experimental.h>

            
            #  include <__configuration/hardening.h>

            
            #  include <__configuration/language.h>

            
            #  include <__configuration/namespace.h>

            
            #  include <__configuration/platform.h>


            // The attributes supported by clang are documented at https://clang.llvm.org/docs/AttributeReference.html


            // _LIBCPP_VERSION represents the version of libc++, which matches the version of LLVM.

            
            // Given a LLVM release LLVM XX.YY.ZZ (e.g. LLVM 17.0.1 == 17.00.01), _LIBCPP_VERSION is

            
            // defined to XXYYZZ.

            
            #  define _LIBCPP_VERSION 230000


            #  define _LIBCPP_CONCAT_IMPL(_X, _Y) _X##_Y

            
            #  define _LIBCPP_CONCAT(_X, _Y) _LIBCPP_CONCAT_IMPL(_X, _Y)

            
            #  define _LIBCPP_CONCAT3(X, Y, Z) _LIBCPP_CONCAT(X, _LIBCPP_CONCAT(Y, Z))


            #  define _LIBCPP_TOSTRING2(x) #x

            
            #  define _LIBCPP_TOSTRING(x) _LIBCPP_TOSTRING2(x)


            #  ifndef __has_constexpr_builtin

            
            #    define __has_constexpr_builtin(x) 0

            
            #  endif


            // This checks wheter a Clang module is built

            
            #  ifndef __building_module

            
            #    define __building_module(...) 0

            
            #  endif


            // '__is_identifier' returns '0' if '__x' is a reserved identifier provided by

            
            // the compiler and '1' otherwise.

            
            #  ifndef __is_identifier

            
            #    define __is_identifier(__x) 1

            
            #  endif


            #  define __has_keyword(__x) !(__is_identifier(__x))


            #  ifndef __has_warning

            
            #    define __has_warning(...) 0

            
            #  endif


            #  if !defined(_LIBCPP_COMPILER_CLANG_BASED) && __cplusplus < 201103L

            
            #    error "libc++ only supports C++03 with Clang-based compilers. Please enable C++11"

            
            #  endif


            #  if defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_NO_VCRUNTIME)

            
            #    define _LIBCPP_ABI_VCRUNTIME

            
            #  endif


            #  if defined(__MVS__)

            
            #    include <features.h> // for __NATIVE_ASCII_F

            
            #  endif


            #  if defined(_WIN32)

            
            #    define _LIBCPP_WIN32API

            
            #    define _LIBCPP_SHORT_WCHAR 1

            
            // Both MinGW and native MSVC provide a "MSVC"-like environment

            
            #    define _LIBCPP_MSVCRT_LIKE

            
            // If mingw not explicitly detected, assume using MS C runtime only if

            
            // a MS compatibility version is specified.

            
            #    if defined(_MSC_VER) && !defined(__MINGW32__)

            
            #      define _LIBCPP_MSVCRT // Using Microsoft's C Runtime library

            
            #    endif

            
            #    if (defined(_M_AMD64) || defined(__x86_64__)) || (defined(_M_ARM) || defined(__arm__))

            
            #      define _LIBCPP_HAS_BITSCAN64 1

            
            #    else

            
            #      define _LIBCPP_HAS_BITSCAN64 0

            
            #    endif

            
            #    define _LIBCPP_HAS_OPEN_WITH_WCHAR 1

            
            #  else

            
            #    define _LIBCPP_HAS_OPEN_WITH_WCHAR 0

            
            #    define _LIBCPP_HAS_BITSCAN64 0

            
            #  endif // defined(_WIN32)


            #  if defined(_AIX) && !defined(__64BIT__)

            
            // The size of wchar is 2 byte on 32-bit mode on AIX.

            
            #    define _LIBCPP_SHORT_WCHAR 1

            
            #  endif


            // Libc++ supports various implementations of std::random_device.

            
            //

            
            // _LIBCPP_USING_DEV_RANDOM

            
            //      Read entropy from the given file, by default `/dev/urandom`.

            
            //      If a token is provided, it is assumed to be the path to a file

            
            //      to read entropy from. This is the default behavior if nothing

            
            //      else is specified. This implementation requires storing state

            
            //      inside `std::random_device`.

            
            //

            
            // _LIBCPP_USING_ARC4_RANDOM

            
            //      Use arc4random(). This allows obtaining random data even when

            
            //      using sandboxing mechanisms. On some platforms like Apple, this

            
            //      is the recommended source of entropy for user-space programs.

            
            //      When this option is used, the token passed to `std::random_device`'s

            
            //      constructor *must* be "/dev/urandom" -- anything else is an error.

            
            //

            
            // _LIBCPP_USING_GETENTROPY

            
            //      Use getentropy().

            
            //      When this option is used, the token passed to `std::random_device`'s

            
            //      constructor *must* be "/dev/urandom" -- anything else is an error.

            
            //

            
            // _LIBCPP_USING_FUCHSIA_CPRNG

            
            //      Use Fuchsia's zx_cprng_draw() system call, which is specified to

            
            //      deliver high-quality entropy and cannot fail.

            
            //      When this option is used, the token passed to `std::random_device`'s

            
            //      constructor *must* be "/dev/urandom" -- anything else is an error.

            
            //

            
            // _LIBCPP_USING_WIN32_RANDOM

            
            //      Use rand_s(), for use on Windows.

            
            //      When this option is used, the token passed to `std::random_device`'s

            
            //      constructor *must* be "/dev/urandom" -- anything else is an error.

            
            #  if defined(__APPLE__) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) ||                     \

            
                  defined(__DragonFly__)

            
            #    define _LIBCPP_USING_ARC4_RANDOM

            
            #  elif defined(__wasi__) || defined(__EMSCRIPTEN__)

            
            #    define _LIBCPP_USING_GETENTROPY

            
            #  elif defined(__Fuchsia__)

            
            #    define _LIBCPP_USING_FUCHSIA_CPRNG

            
            #  elif defined(_LIBCPP_WIN32API)

            
            #    define _LIBCPP_USING_WIN32_RANDOM

            
            #  else

            
            #    define _LIBCPP_USING_DEV_RANDOM

            
            #  endif


            #  ifndef _LIBCPP_CXX03_LANG


            #    define _LIBCPP_ALIGNOF(...) alignof(__VA_ARGS__)

            
            #    define _ALIGNAS_TYPE(x) alignas(x)

            
            #    define _ALIGNAS(x) alignas(x)

            
            #    define _NOEXCEPT noexcept

            
            #    define _NOEXCEPT_(...) noexcept(__VA_ARGS__)

            
            #    define _LIBCPP_CONSTEXPR constexpr


            #  else


            #    define _LIBCPP_ALIGNOF(...) _Alignof(__VA_ARGS__)

            
            #    define _ALIGNAS_TYPE(x) __attribute__((__aligned__(_LIBCPP_ALIGNOF(x))))

            
            #    define _ALIGNAS(x) __attribute__((__aligned__(x)))

            
            #    define nullptr __nullptr

            
            #    define _NOEXCEPT throw()

            
            #    define _NOEXCEPT_(...)

            
            #    define static_assert(...) _Static_assert(__VA_ARGS__)

            
            #    define decltype(...) __decltype(__VA_ARGS__)

            
            #    define _LIBCPP_CONSTEXPR


            typedef __char16_t char16_t;

            
            typedef __char32_t char32_t;


            #  endif


            #  define _LIBCPP_PREFERRED_ALIGNOF(_Tp) __alignof(_Tp)


            #  if __has_extension(blocks) && defined(__APPLE__)

            
            #    define _LIBCPP_HAS_BLOCKS_RUNTIME 1

            
            #  else

            
            #    define _LIBCPP_HAS_BLOCKS_RUNTIME 0

            
            #  endif


            #  if !defined(__SIZEOF_INT128__) || defined(_MSC_VER)

            
            #    define _LIBCPP_HAS_INT128 0

            
            #  else

            
            #    define _LIBCPP_HAS_INT128 1

            
            #  endif


            #  ifdef _LIBCPP_CXX03_LANG

            
            #    define _LIBCPP_DECLARE_STRONG_ENUM(x)                                                                             \

            
                  struct _LIBCPP_EXPORTED_FROM_ABI x {                                                                             \

            
                    enum __lx

            
            // clang-format off

            
            #    define _LIBCPP_DECLARE_STRONG_ENUM_EPILOG(x)                                                                      \

            
                  __lx __v_;                                                                                                       \

            
                  _LIBCPP_HIDE_FROM_ABI x(__lx __v) : __v_(__v) {}                                                                 \

            
                  _LIBCPP_HIDE_FROM_ABI explicit x(int __v) : __v_(static_cast<__lx>(__v)) {}                                      \

            
                  _LIBCPP_HIDE_FROM_ABI operator int() const { return __v_; }                                                      \

            
                  };

            
            // clang-format on


            #  else // _LIBCPP_CXX03_LANG

            
            #    define _LIBCPP_DECLARE_STRONG_ENUM(x) enum class x

            
            #    define _LIBCPP_DECLARE_STRONG_ENUM_EPILOG(x)

            
            #  endif // _LIBCPP_CXX03_LANG


            #  ifdef __FreeBSD__

            
            #    define _DECLARE_C99_LDBL_MATH 1

            
            #  endif


            // If we are getting operator new from the MSVC CRT, then allocation overloads

            
            // for align_val_t were added in 19.12, aka VS 2017 version 15.3.

            
            #  if defined(_LIBCPP_MSVCRT) && defined(_MSC_VER) && _MSC_VER < 1912

            
            #    define _LIBCPP_HAS_LIBRARY_ALIGNED_ALLOCATION 0

            
            #  elif defined(_LIBCPP_ABI_VCRUNTIME) && !defined(__cpp_aligned_new)

            
            // We're deferring to Microsoft's STL to provide aligned new et al. We don't

            
            // have it unless the language feature test macro is defined.

            
            #    define _LIBCPP_HAS_LIBRARY_ALIGNED_ALLOCATION 0

            
            #  elif defined(__MVS__)

            
            #    define _LIBCPP_HAS_LIBRARY_ALIGNED_ALLOCATION 0

            
            #  else

            
            #    define _LIBCPP_HAS_LIBRARY_ALIGNED_ALLOCATION 1

            
            #  endif


            #  if !_LIBCPP_HAS_LIBRARY_ALIGNED_ALLOCATION || (!defined(__cpp_aligned_new) || __cpp_aligned_new < 201606)

            
            #    define _LIBCPP_HAS_ALIGNED_ALLOCATION 0

            
            #  else

            
            #    define _LIBCPP_HAS_ALIGNED_ALLOCATION 1

            
            #  endif


            #  if defined(__APPLE__) || defined(__FreeBSD__)

            
            #    define _LIBCPP_WCTYPE_IS_MASK

            
            #  endif


            // FIXME: using `#warning` causes diagnostics from system headers which include deprecated headers. This can only be

            
            // enabled again once https://github.com/llvm/llvm-project/pull/168041 (or a similar feature) has landed, since that

            
            // allows suppression in system headers.

            
            #  if defined(__DEPRECATED) && __DEPRECATED && !defined(_LIBCPP_DISABLE_DEPRECATION_WARNINGS) && 0

            
            #    define _LIBCPP_DIAGNOSE_DEPRECATED_HEADERS 1

            
            #  else

            
            #    define _LIBCPP_DIAGNOSE_DEPRECATED_HEADERS 0

            
            #  endif


            #  if _LIBCPP_STD_VER <= 11

            
            #    define _LIBCPP_EXPLICIT_SINCE_CXX14

            
            #  else

            
            #    define _LIBCPP_EXPLICIT_SINCE_CXX14 explicit

            
            #  endif


            #  if _LIBCPP_STD_VER >= 23

            
            #    define _LIBCPP_EXPLICIT_SINCE_CXX23 explicit

            
            #  else

            
            #    define _LIBCPP_EXPLICIT_SINCE_CXX23

            
            #  endif


            #  if _LIBCPP_STD_VER >= 14

            
            #    define _LIBCPP_CONSTEXPR_SINCE_CXX14 constexpr

            
            #  else

            
            #    define _LIBCPP_CONSTEXPR_SINCE_CXX14

            
            #  endif


            #  if _LIBCPP_STD_VER >= 17

            
            #    define _LIBCPP_CONSTEXPR_SINCE_CXX17 constexpr

            
            #  else

            
            #    define _LIBCPP_CONSTEXPR_SINCE_CXX17

            
            #  endif


            #  if _LIBCPP_STD_VER >= 20

            
            #    define _LIBCPP_CONSTEXPR_SINCE_CXX20 constexpr

            
            #  else

            
            #    define _LIBCPP_CONSTEXPR_SINCE_CXX20

            
            #  endif


            #  if _LIBCPP_STD_VER >= 23

            
            #    define _LIBCPP_CONSTEXPR_SINCE_CXX23 constexpr

            
            #  else

            
            #    define _LIBCPP_CONSTEXPR_SINCE_CXX23

            
            #  endif


            #  if _LIBCPP_STD_VER >= 26

            
            #    define _LIBCPP_CONSTEXPR_SINCE_CXX26 constexpr

            
            #  else

            
            #    define _LIBCPP_CONSTEXPR_SINCE_CXX26

            
            #  endif


            // Thread API

            
            // clang-format off

            
            #  if _LIBCPP_HAS_THREADS &&                                                                                           \

            
                  !_LIBCPP_HAS_THREAD_API_PTHREAD &&                                                                               \

            
                  !_LIBCPP_HAS_THREAD_API_WIN32 &&                                                                                 \

            
                  !_LIBCPP_HAS_THREAD_API_EXTERNAL &&                                                                              \

            
                  !_LIBCPP_HAS_THREAD_API_C11


            #    if defined(__FreeBSD__) ||                                                                                        \

            
                    defined(__wasi__) ||                                                                                           \

            
                    defined(__NetBSD__) ||                                                                                         \

            
                    defined(__OpenBSD__) ||                                                                                        \

            
                    defined(__NuttX__) ||                                                                                          \

            
                    defined(__linux__) ||                                                                                          \

            
                    defined(__GNU__) ||                                                                                            \

            
                    defined(__APPLE__) ||                                                                                          \

            
                    defined(__MVS__) ||                                                                                            \

            
                    defined(_AIX) ||                                                                                               \

            
                    defined(__EMSCRIPTEN__)

            
            // clang-format on

            
            #      undef _LIBCPP_HAS_THREAD_API_PTHREAD

            
            #      define _LIBCPP_HAS_THREAD_API_PTHREAD 1

            
            #    elif defined(__Fuchsia__)

            
            // TODO(44575): Switch to C11 thread API when possible.

            
            #      undef _LIBCPP_HAS_THREAD_API_PTHREAD

            
            #      define _LIBCPP_HAS_THREAD_API_PTHREAD 1

            
            #    elif defined(_LIBCPP_WIN32API)

            
            #      undef _LIBCPP_HAS_THREAD_API_WIN32

            
            #      define _LIBCPP_HAS_THREAD_API_WIN32 1

            
            #    else

            
            #      error "No thread API"

            
            #    endif // _LIBCPP_HAS_THREAD_API

            
            #  endif   // _LIBCPP_HAS_THREADS


            #  if !_LIBCPP_HAS_THREAD_API_PTHREAD

            
            #    define _LIBCPP_HAS_COND_CLOCKWAIT 0

            
            #  elif (defined(__ANDROID__) && __ANDROID_API__ >= 30) || _LIBCPP_GLIBC_PREREQ(2, 30)

            
            #    define _LIBCPP_HAS_COND_CLOCKWAIT 1

            
            #  else

            
            #    define _LIBCPP_HAS_COND_CLOCKWAIT 0

            
            #  endif


            #  if !_LIBCPP_HAS_THREADS && _LIBCPP_HAS_THREAD_API_PTHREAD

            
            #    error _LIBCPP_HAS_THREAD_API_PTHREAD may only be true when _LIBCPP_HAS_THREADS is true.

            
            #  endif


            #  if !_LIBCPP_HAS_THREADS && _LIBCPP_HAS_THREAD_API_EXTERNAL

            
            #    error _LIBCPP_HAS_THREAD_API_EXTERNAL may only be true when _LIBCPP_HAS_THREADS is true.

            
            #  endif


            #  if !_LIBCPP_HAS_THREADS && _LIBCPP_HAS_THREAD_API_C11

            
            #    error _LIBCPP_HAS_THREAD_API_C11 may only be true when _LIBCPP_HAS_THREADS is true.

            
            #  endif


            #  if !_LIBCPP_HAS_MONOTONIC_CLOCK && _LIBCPP_HAS_THREADS

            
            #    error _LIBCPP_HAS_MONOTONIC_CLOCK may only be false when _LIBCPP_HAS_THREADS is false.

            
            #  endif


            #  if _LIBCPP_HAS_THREADS && !defined(__STDCPP_THREADS__)

            
            #    define __STDCPP_THREADS__ 1

            
            #  endif


            // The glibc and Bionic implementation of pthreads implements

            
            // pthread_mutex_destroy as nop for regular mutexes. Additionally, Win32

            
            // mutexes have no destroy mechanism.

            
            //

            
            // This optimization can't be performed on Apple platforms, where

            
            // pthread_mutex_destroy can allow the kernel to release resources.

            
            // See https://llvm.org/D64298 for details.

            
            //

            
            // TODO(EricWF): Enable this optimization on Bionic after speaking to their

            
            //               respective stakeholders.

            
            // clang-format off

            
            #  if (_LIBCPP_HAS_THREAD_API_PTHREAD && defined(__GLIBC__)) ||                                                        \

            
                  (_LIBCPP_HAS_THREAD_API_C11 && defined(__Fuchsia__)) ||                                                          \

            
                   _LIBCPP_HAS_THREAD_API_WIN32

            
            // clang-format on

            
            #    define _LIBCPP_HAS_TRIVIAL_MUTEX_DESTRUCTION 1

            
            #  else

            
            #    define _LIBCPP_HAS_TRIVIAL_MUTEX_DESTRUCTION 0

            
            #  endif


            // Destroying a condvar is a nop on Windows.

            
            //

            
            // This optimization can't be performed on Apple platforms, where

            
            // pthread_cond_destroy can allow the kernel to release resources.

            
            // See https://llvm.org/D64298 for details.

            
            //

            
            // TODO(EricWF): This is potentially true for some pthread implementations

            
            // as well.

            
            #  if (_LIBCPP_HAS_THREAD_API_C11 && defined(__Fuchsia__)) || _LIBCPP_HAS_THREAD_API_WIN32

            
            #    define _LIBCPP_HAS_TRIVIAL_CONDVAR_DESTRUCTION 1

            
            #  else

            
            #    define _LIBCPP_HAS_TRIVIAL_CONDVAR_DESTRUCTION 0

            
            #  endif


            #  if defined(__BIONIC__) || defined(__NuttX__) || defined(__Fuchsia__) || defined(__wasi__) ||                        \

            
                  _LIBCPP_HAS_MUSL_LIBC || defined(__OpenBSD__) || _LIBCPP_LIBC_LLVM_LIBC

            
            #    define _LIBCPP_PROVIDES_DEFAULT_RUNE_TABLE

            
            #  endif


            #  if __has_feature(cxx_atomic) || __has_extension(c_atomic) || __has_keyword(_Atomic)

            
            #    define _LIBCPP_HAS_C_ATOMIC_IMP 1

            
            #    define _LIBCPP_HAS_GCC_ATOMIC_IMP 0

            
            #    define _LIBCPP_HAS_EXTERNAL_ATOMIC_IMP 0

            
            #  elif defined(_LIBCPP_COMPILER_GCC)

            
            #    define _LIBCPP_HAS_C_ATOMIC_IMP 0

            
            #    define _LIBCPP_HAS_GCC_ATOMIC_IMP 1

            
            #    define _LIBCPP_HAS_EXTERNAL_ATOMIC_IMP 0

            
            #  endif


            #  if !_LIBCPP_HAS_C_ATOMIC_IMP && !_LIBCPP_HAS_GCC_ATOMIC_IMP && !_LIBCPP_HAS_EXTERNAL_ATOMIC_IMP

            
            #    define _LIBCPP_HAS_ATOMIC_HEADER 0

            
            #  else

            
            #    define _LIBCPP_HAS_ATOMIC_HEADER 1

            
            #    ifndef _LIBCPP_ATOMIC_FLAG_TYPE

            
            #      define _LIBCPP_ATOMIC_FLAG_TYPE bool

            
            #    endif

            
            #  endif


            // We often repeat things just for handling wide characters in the library.

            
            // When wide characters are disabled, it can be useful to have a quick way of

            
            // disabling it without having to resort to #if-#endif, which has a larger

            
            // impact on readability.

            
            #  if !_LIBCPP_HAS_WIDE_CHARACTERS

            
            #    define _LIBCPP_IF_WIDE_CHARACTERS(...)

            
            #  else

            
            #    define _LIBCPP_IF_WIDE_CHARACTERS(...) __VA_ARGS__

            
            #  endif


            // clang-format off

            
            #  define _LIBCPP_PUSH_MACROS _Pragma("push_macro(\"min\")") _Pragma("push_macro(\"max\")") _Pragma("push_macro(\"refresh\")") _Pragma("push_macro(\"move\")") _Pragma("push_macro(\"erase\")")

            
            #  define _LIBCPP_POP_MACROS _Pragma("pop_macro(\"min\")") _Pragma("pop_macro(\"max\")") _Pragma("pop_macro(\"refresh\")") _Pragma("pop_macro(\"move\")") _Pragma("pop_macro(\"erase\")")

            
            // clang-format on


            #  ifndef _LIBCPP_NO_AUTO_LINK

            
            #    if defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_BUILDING_LIBRARY)

            
            #      if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)

            
            #        pragma comment(lib, "c++.lib")

            
            #      else

            
            #        pragma comment(lib, "libc++.lib")

            
            #      endif

            
            #    endif // defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_BUILDING_LIBRARY)

            
            #  endif   // _LIBCPP_NO_AUTO_LINK


            // Configures the fopen close-on-exec mode character, if any. This string will

            
            // be appended to any mode string used by fstream for fopen/fdopen.

            
            //

            
            // Not all platforms support this, but it helps avoid fd-leaks on platforms that

            
            // do.

            
            #  if defined(__BIONIC__)

            
            #    define _LIBCPP_FOPEN_CLOEXEC_MODE "e"

            
            #  else

            
            #    define _LIBCPP_FOPEN_CLOEXEC_MODE

            
            #  endif


            // c8rtomb() and mbrtoc8() were added in C++20 and C23. Support for these

            
            // functions is gradually being added to existing C libraries. The conditions

            
            // below check for known C library versions and conditions under which these

            
            // functions are declared by the C library.

            
            //

            
            // GNU libc 2.36 and newer declare c8rtomb() and mbrtoc8() in C++ modes if

            
            // __cpp_char8_t is defined or if C2X extensions are enabled. Determining

            
            // the latter depends on internal GNU libc details that are not appropriate

            
            // to depend on here, so any declarations present when __cpp_char8_t is not

            
            // defined are ignored.

            
            #  if _LIBCPP_GLIBC_PREREQ(2, 36) && defined(__cpp_char8_t)

            
            #    define _LIBCPP_HAS_C8RTOMB_MBRTOC8 1

            
            #  else

            
            #    define _LIBCPP_HAS_C8RTOMB_MBRTOC8 0

            
            #  endif


            // There are a handful of public standard library types that are intended to

            
            // support CTAD but don't need any explicit deduction guides to do so. This

            
            // macro is used to mark them as such, which suppresses the

            
            // '-Wctad-maybe-unsupported' compiler warning when CTAD is used in user code

            
            // with these classes.

            
            #  if _LIBCPP_STD_VER >= 17

            
            #    ifdef _LIBCPP_COMPILER_CLANG_BASED

            
            #      define _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(_ClassName)                                                              \

            
                    template <class... _Tag>                                                                                       \

            
                    [[maybe_unused]] _ClassName(typename _Tag::__allow_ctad...)->_ClassName<_Tag...>

            
            #    else

            
            #      define _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(ClassName)                                                               \

            
                    template <class... _Tag>                                                                                       \

            
                    ClassName(typename _Tag::__allow_ctad...)->ClassName<_Tag...>

            
            #    endif

            
            #  else

            
            #    define _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(_ClassName) static_assert(true, "")

            
            #  endif


            #  if defined(__OBJC__) && defined(_LIBCPP_APPLE_CLANG_VER)

            
            #    define _LIBCPP_WORKAROUND_OBJCXX_COMPILER_INTRINSICS

            
            #  endif


            #  define _PSTL_PRAGMA(x) _Pragma(#x)


            // Enable SIMD for compilers that support OpenMP 4.0

            
            #  if (defined(_OPENMP) && _OPENMP >= 201307)


            #    define _PSTL_UDR_PRESENT

            
            #    define _PSTL_PRAGMA_SIMD _PSTL_PRAGMA(omp simd)

            
            #    define _PSTL_PRAGMA_DECLARE_SIMD _PSTL_PRAGMA(omp declare simd)

            
            #    define _PSTL_PRAGMA_SIMD_REDUCTION(PRM) _PSTL_PRAGMA(omp simd reduction(PRM))

            
            #    define _PSTL_PRAGMA_SIMD_SCAN(PRM) _PSTL_PRAGMA(omp simd reduction(inscan, PRM))

            
            #    define _PSTL_PRAGMA_SIMD_INCLUSIVE_SCAN(PRM) _PSTL_PRAGMA(omp scan inclusive(PRM))

            
            #    define _PSTL_PRAGMA_SIMD_EXCLUSIVE_SCAN(PRM) _PSTL_PRAGMA(omp scan exclusive(PRM))


            // Declaration of reduction functor, where

            
            // NAME - the name of the functor

            
            // OP - type of the callable object with the reduction operation

            
            // omp_in - refers to the local partial result

            
            // omp_out - refers to the final value of the combiner operator

            
            // omp_priv - refers to the private copy of the initial value

            
            // omp_orig - refers to the original variable to be reduced

            
            #    define _PSTL_PRAGMA_DECLARE_REDUCTION(NAME, OP)                                                                   \

            
                  _PSTL_PRAGMA(omp declare reduction(NAME:OP : omp_out(omp_in)) initializer(omp_priv = omp_orig))


            #  elif defined(_LIBCPP_COMPILER_CLANG_BASED)


            #    define _PSTL_PRAGMA_SIMD _Pragma("clang loop vectorize(enable) interleave(enable)")

            
            #    define _PSTL_PRAGMA_DECLARE_SIMD

            
            #    define _PSTL_PRAGMA_SIMD_REDUCTION(PRM) _Pragma("clang loop vectorize(enable) interleave(enable)")

            
            #    define _PSTL_PRAGMA_SIMD_SCAN(PRM) _Pragma("clang loop vectorize(enable) interleave(enable)")

            
            #    define _PSTL_PRAGMA_SIMD_INCLUSIVE_SCAN(PRM)

            
            #    define _PSTL_PRAGMA_SIMD_EXCLUSIVE_SCAN(PRM)

            
            #    define _PSTL_PRAGMA_DECLARE_REDUCTION(NAME, OP)


            #  else // (defined(_OPENMP) && _OPENMP >= 201307)


            #    define _PSTL_PRAGMA_SIMD

            
            #    define _PSTL_PRAGMA_DECLARE_SIMD

            
            #    define _PSTL_PRAGMA_SIMD_REDUCTION(PRM)

            
            #    define _PSTL_PRAGMA_SIMD_SCAN(PRM)

            
            #    define _PSTL_PRAGMA_SIMD_INCLUSIVE_SCAN(PRM)

            
            #    define _PSTL_PRAGMA_SIMD_EXCLUSIVE_SCAN(PRM)

            
            #    define _PSTL_PRAGMA_DECLARE_REDUCTION(NAME, OP)


            #  endif // (defined(_OPENMP) && _OPENMP >= 201307)


            #  define _PSTL_USE_NONTEMPORAL_STORES_IF_ALLOWED


            #endif // __cplusplus


            #endif // _LIBCPP___CONFIG
	// -- C++ --
	//===----------------------------------------------------------------------===//
	//
	// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
	// See https://llvm.org/LICENSE.txt for license information.
	// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
	//
	//===----------------------------------------------------------------------===//

	#ifndef _LIBCPP___CONFIG
	#define _LIBCPP___CONFIG

	#include <__config_site>

	#ifndef _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER
	# pragma GCC system_header
	#endif

	#ifdef __cplusplus

	# include <__configuration/abi.h>
	# include <__configuration/attributes.h>
	# include <__configuration/availability.h>
	# include <__configuration/compiler.h>
	# include <__configuration/diagnostic_suppression.h>
	# include <__configuration/experimental.h>
	# include <__configuration/hardening.h>
	# include <__configuration/language.h>
	# include <__configuration/namespace.h>
	# include <__configuration/platform.h>

	// The attributes supported by clang are documented at https://clang.llvm.org/docs/AttributeReference.html

	// _LIBCPP_VERSION represents the version of libc++, which matches the version of LLVM.
	// Given a LLVM release LLVM XX.YY.ZZ (e.g. LLVM 17.0.1 == 17.00.01), _LIBCPP_VERSION is
	// defined to XXYYZZ.
	# define _LIBCPP_VERSION 230000

	# define _LIBCPP_CONCAT_IMPL(_X, _Y) _X##_Y
	# define _LIBCPP_CONCAT(_X, _Y) _LIBCPP_CONCAT_IMPL(_X, _Y)
	# define _LIBCPP_CONCAT3(X, Y, Z) _LIBCPP_CONCAT(X, _LIBCPP_CONCAT(Y, Z))

	# define _LIBCPP_TOSTRING2(x) #x
	# define _LIBCPP_TOSTRING(x) _LIBCPP_TOSTRING2(x)

	# ifndef __has_constexpr_builtin
	# define __has_constexpr_builtin(x) 0
	# endif

	// This checks wheter a Clang module is built
	# ifndef __building_module
	# define __building_module(...) 0
	# endif

	// '__is_identifier' returns '0' if '__x' is a reserved identifier provided by
	// the compiler and '1' otherwise.
	# ifndef __is_identifier
	# define __is_identifier(__x) 1
	# endif

	# define __has_keyword(__x) !(__is_identifier(__x))

	# ifndef __has_warning
	# define __has_warning(...) 0
	# endif

	# if !defined(_LIBCPP_COMPILER_CLANG_BASED) && __cplusplus < 201103L
	# error "libc++ only supports C++03 with Clang-based compilers. Please enable C++11"
	# endif

	# if defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_NO_VCRUNTIME)
	# define _LIBCPP_ABI_VCRUNTIME
	# endif

	# if defined(__MVS__)
	# include <features.h> // for __NATIVE_ASCII_F
	# endif

	# if defined(_WIN32)
	# define _LIBCPP_WIN32API
	# define _LIBCPP_SHORT_WCHAR 1
	// Both MinGW and native MSVC provide a "MSVC"-like environment
	# define _LIBCPP_MSVCRT_LIKE
	// If mingw not explicitly detected, assume using MS C runtime only if
	// a MS compatibility version is specified.
	# if defined(_MSC_VER) && !defined(__MINGW32__)
	# define _LIBCPP_MSVCRT // Using Microsoft's C Runtime library
	# endif
	# if (defined(_M_AMD64) \|\| defined(__x86_64__)) \|\| (defined(_M_ARM) \|\| defined(__arm__))
	# define _LIBCPP_HAS_BITSCAN64 1
	# else
	# define _LIBCPP_HAS_BITSCAN64 0
	# endif
	# define _LIBCPP_HAS_OPEN_WITH_WCHAR 1
	# else
	# define _LIBCPP_HAS_OPEN_WITH_WCHAR 0
	# define _LIBCPP_HAS_BITSCAN64 0
	# endif // defined(_WIN32)

	# if defined(_AIX) && !defined(__64BIT__)
	// The size of wchar is 2 byte on 32-bit mode on AIX.
	# define _LIBCPP_SHORT_WCHAR 1
	# endif

	// Libc++ supports various implementations of std::random_device.
	//
	// _LIBCPP_USING_DEV_RANDOM
	// Read entropy from the given file, by default `/dev/urandom`.
	// If a token is provided, it is assumed to be the path to a file
	// to read entropy from. This is the default behavior if nothing
	// else is specified. This implementation requires storing state
	// inside `std::random_device`.
	//
	// _LIBCPP_USING_ARC4_RANDOM
	// Use arc4random(). This allows obtaining random data even when
	// using sandboxing mechanisms. On some platforms like Apple, this
	// is the recommended source of entropy for user-space programs.
	// When this option is used, the token passed to `std::random_device`'s
	// constructor must be "/dev/urandom" -- anything else is an error.
	//
	// _LIBCPP_USING_GETENTROPY
	// Use getentropy().
	// When this option is used, the token passed to `std::random_device`'s
	// constructor must be "/dev/urandom" -- anything else is an error.
	//
	// _LIBCPP_USING_FUCHSIA_CPRNG
	// Use Fuchsia's zx_cprng_draw() system call, which is specified to
	// deliver high-quality entropy and cannot fail.
	// When this option is used, the token passed to `std::random_device`'s
	// constructor must be "/dev/urandom" -- anything else is an error.
	//
	// _LIBCPP_USING_WIN32_RANDOM
	// Use rand_s(), for use on Windows.
	// When this option is used, the token passed to `std::random_device`'s
	// constructor must be "/dev/urandom" -- anything else is an error.
	# if defined(__APPLE__) \|\| defined(__FreeBSD__) \|\| defined(__NetBSD__) \|\| defined(__OpenBSD__) \|\| \
	defined(__DragonFly__)
	# define _LIBCPP_USING_ARC4_RANDOM
	# elif defined(__wasi__) \|\| defined(__EMSCRIPTEN__)
	# define _LIBCPP_USING_GETENTROPY
	# elif defined(__Fuchsia__)
	# define _LIBCPP_USING_FUCHSIA_CPRNG
	# elif defined(_LIBCPP_WIN32API)
	# define _LIBCPP_USING_WIN32_RANDOM
	# else
	# define _LIBCPP_USING_DEV_RANDOM
	# endif

	# ifndef _LIBCPP_CXX03_LANG

	# define _LIBCPP_ALIGNOF(...) alignof(__VA_ARGS__)
	# define _ALIGNAS_TYPE(x) alignas(x)
	# define _ALIGNAS(x) alignas(x)
	# define _NOEXCEPT noexcept
	# define _NOEXCEPT_(...) noexcept(__VA_ARGS__)
	# define _LIBCPP_CONSTEXPR constexpr

	# else

	# define _LIBCPP_ALIGNOF(...) _Alignof(__VA_ARGS__)
	# define _ALIGNAS_TYPE(x) __attribute__((__aligned__(_LIBCPP_ALIGNOF(x))))
	# define _ALIGNAS(x) __attribute__((__aligned__(x)))
	# define nullptr __nullptr
	# define _NOEXCEPT throw()
	# define _NOEXCEPT_(...)
	# define static_assert(...) _Static_assert(__VA_ARGS__)
	# define decltype(...) __decltype(__VA_ARGS__)
	# define _LIBCPP_CONSTEXPR

	typedef __char16_t char16_t;
	typedef __char32_t char32_t;

	# endif

	# define _LIBCPP_PREFERRED_ALIGNOF(_Tp) __alignof(_Tp)

	# if __has_extension(blocks) && defined(__APPLE__)
	# define _LIBCPP_HAS_BLOCKS_RUNTIME 1
	# else
	# define _LIBCPP_HAS_BLOCKS_RUNTIME 0
	# endif

	# if !defined(__SIZEOF_INT128__) \|\| defined(_MSC_VER)
	# define _LIBCPP_HAS_INT128 0
	# else
	# define _LIBCPP_HAS_INT128 1
	# endif

	# ifdef _LIBCPP_CXX03_LANG
	# define _LIBCPP_DECLARE_STRONG_ENUM(x) \
	struct _LIBCPP_EXPORTED_FROM_ABI x { \
	enum __lx
	// clang-format off
	# define _LIBCPP_DECLARE_STRONG_ENUM_EPILOG(x) \
	__lx __v_; \
	_LIBCPP_HIDE_FROM_ABI x(__lx __v) : __v_(__v) {} \
	_LIBCPP_HIDE_FROM_ABI explicit x(int __v) : __v_(static_cast<__lx>(__v)) {} \
	_LIBCPP_HIDE_FROM_ABI operator int() const { return __v_; } \
	};
	// clang-format on

	# else // _LIBCPP_CXX03_LANG
	# define _LIBCPP_DECLARE_STRONG_ENUM(x) enum class x
	# define _LIBCPP_DECLARE_STRONG_ENUM_EPILOG(x)
	# endif // _LIBCPP_CXX03_LANG

	# ifdef __FreeBSD__
	# define _DECLARE_C99_LDBL_MATH 1
	# endif

	// If we are getting operator new from the MSVC CRT, then allocation overloads
	// for align_val_t were added in 19.12, aka VS 2017 version 15.3.
	# if defined(_LIBCPP_MSVCRT) && defined(_MSC_VER) && _MSC_VER < 1912
	# define _LIBCPP_HAS_LIBRARY_ALIGNED_ALLOCATION 0
	# elif defined(_LIBCPP_ABI_VCRUNTIME) && !defined(__cpp_aligned_new)
	// We're deferring to Microsoft's STL to provide aligned new et al. We don't
	// have it unless the language feature test macro is defined.
	# define _LIBCPP_HAS_LIBRARY_ALIGNED_ALLOCATION 0
	# elif defined(__MVS__)
	# define _LIBCPP_HAS_LIBRARY_ALIGNED_ALLOCATION 0
	# else
	# define _LIBCPP_HAS_LIBRARY_ALIGNED_ALLOCATION 1
	# endif

	# if !_LIBCPP_HAS_LIBRARY_ALIGNED_ALLOCATION \|\| (!defined(__cpp_aligned_new) \|\| __cpp_aligned_new < 201606)
	# define _LIBCPP_HAS_ALIGNED_ALLOCATION 0
	# else
	# define _LIBCPP_HAS_ALIGNED_ALLOCATION 1
	# endif

	# if defined(__APPLE__) \|\| defined(__FreeBSD__)
	# define _LIBCPP_WCTYPE_IS_MASK
	# endif

	// FIXME: using `#warning` causes diagnostics from system headers which include deprecated headers. This can only be
	// enabled again once https://github.com/llvm/llvm-project/pull/168041 (or a similar feature) has landed, since that
	// allows suppression in system headers.
	# if defined(__DEPRECATED) && __DEPRECATED && !defined(_LIBCPP_DISABLE_DEPRECATION_WARNINGS) && 0
	# define _LIBCPP_DIAGNOSE_DEPRECATED_HEADERS 1
	# else
	# define _LIBCPP_DIAGNOSE_DEPRECATED_HEADERS 0
	# endif

	# if _LIBCPP_STD_VER <= 11
	# define _LIBCPP_EXPLICIT_SINCE_CXX14
	# else
	# define _LIBCPP_EXPLICIT_SINCE_CXX14 explicit
	# endif

	# if _LIBCPP_STD_VER >= 23
	# define _LIBCPP_EXPLICIT_SINCE_CXX23 explicit
	# else
	# define _LIBCPP_EXPLICIT_SINCE_CXX23
	# endif

	# if _LIBCPP_STD_VER >= 14
	# define _LIBCPP_CONSTEXPR_SINCE_CXX14 constexpr
	# else
	# define _LIBCPP_CONSTEXPR_SINCE_CXX14
	# endif

	# if _LIBCPP_STD_VER >= 17
	# define _LIBCPP_CONSTEXPR_SINCE_CXX17 constexpr
	# else
	# define _LIBCPP_CONSTEXPR_SINCE_CXX17
	# endif

	# if _LIBCPP_STD_VER >= 20
	# define _LIBCPP_CONSTEXPR_SINCE_CXX20 constexpr
	# else
	# define _LIBCPP_CONSTEXPR_SINCE_CXX20
	# endif

	# if _LIBCPP_STD_VER >= 23
	# define _LIBCPP_CONSTEXPR_SINCE_CXX23 constexpr
	# else
	# define _LIBCPP_CONSTEXPR_SINCE_CXX23
	# endif

	# if _LIBCPP_STD_VER >= 26
	# define _LIBCPP_CONSTEXPR_SINCE_CXX26 constexpr
	# else
	# define _LIBCPP_CONSTEXPR_SINCE_CXX26
	# endif

	// Thread API
	// clang-format off
	# if _LIBCPP_HAS_THREADS && \
	!_LIBCPP_HAS_THREAD_API_PTHREAD && \
	!_LIBCPP_HAS_THREAD_API_WIN32 && \
	!_LIBCPP_HAS_THREAD_API_EXTERNAL && \
	!_LIBCPP_HAS_THREAD_API_C11

	# if defined(__FreeBSD__) \|\| \
	defined(__wasi__) \|\| \
	defined(__NetBSD__) \|\| \
	defined(__OpenBSD__) \|\| \
	defined(__NuttX__) \|\| \
	defined(__linux__) \|\| \
	defined(__GNU__) \|\| \
	defined(__APPLE__) \|\| \
	defined(__MVS__) \|\| \
	defined(_AIX) \|\| \
	defined(__EMSCRIPTEN__)
	// clang-format on
	# undef _LIBCPP_HAS_THREAD_API_PTHREAD
	# define _LIBCPP_HAS_THREAD_API_PTHREAD 1
	# elif defined(__Fuchsia__)
	// TODO(44575): Switch to C11 thread API when possible.
	# undef _LIBCPP_HAS_THREAD_API_PTHREAD
	# define _LIBCPP_HAS_THREAD_API_PTHREAD 1
	# elif defined(_LIBCPP_WIN32API)
	# undef _LIBCPP_HAS_THREAD_API_WIN32
	# define _LIBCPP_HAS_THREAD_API_WIN32 1
	# else
	# error "No thread API"
	# endif // _LIBCPP_HAS_THREAD_API
	# endif // _LIBCPP_HAS_THREADS

	# if !_LIBCPP_HAS_THREAD_API_PTHREAD
	# define _LIBCPP_HAS_COND_CLOCKWAIT 0
	# elif (defined(__ANDROID__) && __ANDROID_API__ >= 30) \|\| _LIBCPP_GLIBC_PREREQ(2, 30)
	# define _LIBCPP_HAS_COND_CLOCKWAIT 1
	# else
	# define _LIBCPP_HAS_COND_CLOCKWAIT 0
	# endif

	# if !_LIBCPP_HAS_THREADS && _LIBCPP_HAS_THREAD_API_PTHREAD
	# error _LIBCPP_HAS_THREAD_API_PTHREAD may only be true when _LIBCPP_HAS_THREADS is true.
	# endif

	# if !_LIBCPP_HAS_THREADS && _LIBCPP_HAS_THREAD_API_EXTERNAL
	# error _LIBCPP_HAS_THREAD_API_EXTERNAL may only be true when _LIBCPP_HAS_THREADS is true.
	# endif

	# if !_LIBCPP_HAS_THREADS && _LIBCPP_HAS_THREAD_API_C11
	# error _LIBCPP_HAS_THREAD_API_C11 may only be true when _LIBCPP_HAS_THREADS is true.
	# endif

	# if !_LIBCPP_HAS_MONOTONIC_CLOCK && _LIBCPP_HAS_THREADS
	# error _LIBCPP_HAS_MONOTONIC_CLOCK may only be false when _LIBCPP_HAS_THREADS is false.
	# endif

	# if _LIBCPP_HAS_THREADS && !defined(__STDCPP_THREADS__)
	# define __STDCPP_THREADS__ 1
	# endif

	// The glibc and Bionic implementation of pthreads implements
	// pthread_mutex_destroy as nop for regular mutexes. Additionally, Win32
	// mutexes have no destroy mechanism.
	//
	// This optimization can't be performed on Apple platforms, where
	// pthread_mutex_destroy can allow the kernel to release resources.
	// See https://llvm.org/D64298 for details.
	//
	// TODO(EricWF): Enable this optimization on Bionic after speaking to their
	// respective stakeholders.
	// clang-format off
	# if (_LIBCPP_HAS_THREAD_API_PTHREAD && defined(__GLIBC__)) \|\| \
	(_LIBCPP_HAS_THREAD_API_C11 && defined(__Fuchsia__)) \|\| \
	_LIBCPP_HAS_THREAD_API_WIN32
	// clang-format on
	# define _LIBCPP_HAS_TRIVIAL_MUTEX_DESTRUCTION 1
	# else
	# define _LIBCPP_HAS_TRIVIAL_MUTEX_DESTRUCTION 0
	# endif

	// Destroying a condvar is a nop on Windows.
	//
	// This optimization can't be performed on Apple platforms, where
	// pthread_cond_destroy can allow the kernel to release resources.
	// See https://llvm.org/D64298 for details.
	//
	// TODO(EricWF): This is potentially true for some pthread implementations
	// as well.
	# if (_LIBCPP_HAS_THREAD_API_C11 && defined(__Fuchsia__)) \|\| _LIBCPP_HAS_THREAD_API_WIN32
	# define _LIBCPP_HAS_TRIVIAL_CONDVAR_DESTRUCTION 1
	# else
	# define _LIBCPP_HAS_TRIVIAL_CONDVAR_DESTRUCTION 0
	# endif

	# if defined(__BIONIC__) \|\| defined(__NuttX__) \|\| defined(__Fuchsia__) \|\| defined(__wasi__) \|\| \
	_LIBCPP_HAS_MUSL_LIBC \|\| defined(__OpenBSD__) \|\| _LIBCPP_LIBC_LLVM_LIBC
	# define _LIBCPP_PROVIDES_DEFAULT_RUNE_TABLE
	# endif

	# if __has_feature(cxx_atomic) \|\| __has_extension(c_atomic) \|\| __has_keyword(_Atomic)
	# define _LIBCPP_HAS_C_ATOMIC_IMP 1
	# define _LIBCPP_HAS_GCC_ATOMIC_IMP 0
	# define _LIBCPP_HAS_EXTERNAL_ATOMIC_IMP 0
	# elif defined(_LIBCPP_COMPILER_GCC)
	# define _LIBCPP_HAS_C_ATOMIC_IMP 0
	# define _LIBCPP_HAS_GCC_ATOMIC_IMP 1
	# define _LIBCPP_HAS_EXTERNAL_ATOMIC_IMP 0
	# endif

	# if !_LIBCPP_HAS_C_ATOMIC_IMP && !_LIBCPP_HAS_GCC_ATOMIC_IMP && !_LIBCPP_HAS_EXTERNAL_ATOMIC_IMP
	# define _LIBCPP_HAS_ATOMIC_HEADER 0
	# else
	# define _LIBCPP_HAS_ATOMIC_HEADER 1
	# ifndef _LIBCPP_ATOMIC_FLAG_TYPE
	# define _LIBCPP_ATOMIC_FLAG_TYPE bool
	# endif
	# endif

	// We often repeat things just for handling wide characters in the library.
	// When wide characters are disabled, it can be useful to have a quick way of
	// disabling it without having to resort to #if-#endif, which has a larger
	// impact on readability.
	# if !_LIBCPP_HAS_WIDE_CHARACTERS
	# define _LIBCPP_IF_WIDE_CHARACTERS(...)
	# else
	# define _LIBCPP_IF_WIDE_CHARACTERS(...) __VA_ARGS__
	# endif

	// clang-format off
	# define _LIBCPP_PUSH_MACROS _Pragma("push_macro(\"min\")") _Pragma("push_macro(\"max\")") _Pragma("push_macro(\"refresh\")") _Pragma("push_macro(\"move\")") _Pragma("push_macro(\"erase\")")
	# define _LIBCPP_POP_MACROS _Pragma("pop_macro(\"min\")") _Pragma("pop_macro(\"max\")") _Pragma("pop_macro(\"refresh\")") _Pragma("pop_macro(\"move\")") _Pragma("pop_macro(\"erase\")")
	// clang-format on

	# ifndef _LIBCPP_NO_AUTO_LINK
	# if defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_BUILDING_LIBRARY)
	# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)
	# pragma comment(lib, "c++.lib")
	# else
	# pragma comment(lib, "libc++.lib")
	# endif
	# endif // defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_BUILDING_LIBRARY)
	# endif // _LIBCPP_NO_AUTO_LINK

	// Configures the fopen close-on-exec mode character, if any. This string will
	// be appended to any mode string used by fstream for fopen/fdopen.
	//
	// Not all platforms support this, but it helps avoid fd-leaks on platforms that
	// do.
	# if defined(__BIONIC__)
	# define _LIBCPP_FOPEN_CLOEXEC_MODE "e"
	# else
	# define _LIBCPP_FOPEN_CLOEXEC_MODE
	# endif

	// c8rtomb() and mbrtoc8() were added in C++20 and C23. Support for these
	// functions is gradually being added to existing C libraries. The conditions
	// below check for known C library versions and conditions under which these
	// functions are declared by the C library.
	//
	// GNU libc 2.36 and newer declare c8rtomb() and mbrtoc8() in C++ modes if
	// __cpp_char8_t is defined or if C2X extensions are enabled. Determining
	// the latter depends on internal GNU libc details that are not appropriate
	// to depend on here, so any declarations present when __cpp_char8_t is not
	// defined are ignored.
	# if _LIBCPP_GLIBC_PREREQ(2, 36) && defined(__cpp_char8_t)
	# define _LIBCPP_HAS_C8RTOMB_MBRTOC8 1
	# else
	# define _LIBCPP_HAS_C8RTOMB_MBRTOC8 0
	# endif

	// There are a handful of public standard library types that are intended to
	// support CTAD but don't need any explicit deduction guides to do so. This
	// macro is used to mark them as such, which suppresses the
	// '-Wctad-maybe-unsupported' compiler warning when CTAD is used in user code
	// with these classes.
	# if _LIBCPP_STD_VER >= 17
	# ifdef _LIBCPP_COMPILER_CLANG_BASED
	# define _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(_ClassName) \
	template <class... _Tag> \
	[[maybe_unused]] _ClassName(typename _Tag::__allow_ctad...)->_ClassName<_Tag...>
	# else
	# define _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(ClassName) \
	template <class... _Tag> \
	ClassName(typename _Tag::__allow_ctad...)->ClassName<_Tag...>
	# endif
	# else
	# define _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(_ClassName) static_assert(true, "")
	# endif

	# if defined(__OBJC__) && defined(_LIBCPP_APPLE_CLANG_VER)
	# define _LIBCPP_WORKAROUND_OBJCXX_COMPILER_INTRINSICS
	# endif

	# define _PSTL_PRAGMA(x) _Pragma(#x)

	// Enable SIMD for compilers that support OpenMP 4.0
	# if (defined(_OPENMP) && _OPENMP >= 201307)

	# define _PSTL_UDR_PRESENT
	# define _PSTL_PRAGMA_SIMD _PSTL_PRAGMA(omp simd)
	# define _PSTL_PRAGMA_DECLARE_SIMD _PSTL_PRAGMA(omp declare simd)
	# define _PSTL_PRAGMA_SIMD_REDUCTION(PRM) _PSTL_PRAGMA(omp simd reduction(PRM))
	# define _PSTL_PRAGMA_SIMD_SCAN(PRM) _PSTL_PRAGMA(omp simd reduction(inscan, PRM))
	# define _PSTL_PRAGMA_SIMD_INCLUSIVE_SCAN(PRM) _PSTL_PRAGMA(omp scan inclusive(PRM))
	# define _PSTL_PRAGMA_SIMD_EXCLUSIVE_SCAN(PRM) _PSTL_PRAGMA(omp scan exclusive(PRM))

	// Declaration of reduction functor, where
	// NAME - the name of the functor
	// OP - type of the callable object with the reduction operation
	// omp_in - refers to the local partial result
	// omp_out - refers to the final value of the combiner operator
	// omp_priv - refers to the private copy of the initial value
	// omp_orig - refers to the original variable to be reduced
	# define _PSTL_PRAGMA_DECLARE_REDUCTION(NAME, OP) \
	_PSTL_PRAGMA(omp declare reduction(NAME:OP : omp_out(omp_in)) initializer(omp_priv = omp_orig))

	# elif defined(_LIBCPP_COMPILER_CLANG_BASED)

	# define _PSTL_PRAGMA_SIMD _Pragma("clang loop vectorize(enable) interleave(enable)")
	# define _PSTL_PRAGMA_DECLARE_SIMD
	# define _PSTL_PRAGMA_SIMD_REDUCTION(PRM) _Pragma("clang loop vectorize(enable) interleave(enable)")
	# define _PSTL_PRAGMA_SIMD_SCAN(PRM) _Pragma("clang loop vectorize(enable) interleave(enable)")
	# define _PSTL_PRAGMA_SIMD_INCLUSIVE_SCAN(PRM)
	# define _PSTL_PRAGMA_SIMD_EXCLUSIVE_SCAN(PRM)
	# define _PSTL_PRAGMA_DECLARE_REDUCTION(NAME, OP)

	# else // (defined(_OPENMP) && _OPENMP >= 201307)

	# define _PSTL_PRAGMA_SIMD
	# define _PSTL_PRAGMA_DECLARE_SIMD
	# define _PSTL_PRAGMA_SIMD_REDUCTION(PRM)
	# define _PSTL_PRAGMA_SIMD_SCAN(PRM)
	# define _PSTL_PRAGMA_SIMD_INCLUSIVE_SCAN(PRM)
	# define _PSTL_PRAGMA_SIMD_EXCLUSIVE_SCAN(PRM)
	# define _PSTL_PRAGMA_DECLARE_REDUCTION(NAME, OP)

	# endif // (defined(_OPENMP) && _OPENMP >= 201307)

	# define _PSTL_USE_NONTEMPORAL_STORES_IF_ALLOWED

	#endif // __cplusplus

	#endif // _LIBCPP___CONFIG